CGenerator doesn't consider the NOT operator when using reduce_parentheses=True

[Kyvski]

When using the CGenerator class with reduce_parentheses=True, the output still includes unnecessary parentheses around instances of UnaryOp with the NOT operator.

For example:

		      Input: if (a && !b && (!c || d)) …
	     	     Output: if (a && (!b) && ((!c) || d)) …
            Expected Output: if (a && !b && (!c || d)) …

To get around this, I just included UnaryOp in the list of simple nodes for _is_simple_node. Though, I'm not sure if this would have unexpected consequences. Another possible solution would be to include it in the precedence_map, but I couldn't get an ideal output doing it that way.

[eliben]

PRs to fix this are welcome

[FlorianDyck]

included UnaryOp in the list of simple nodes for _is_simple_node. Though, I'm not sure if this would have unexpected consequences. Another possible solution would be to include it in the precedence_map, but I couldn't get an ideal output doing it that way.

(&pointer)++ and &(pointer++) for example have different meanings. There would have to be a priority check like with binary operators